Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8976e6595a6ba3a961cc8e432fce83604266966a428adb9d0f6b7153e1f956e4' 
  AND token = 'So/pBpEy4d38ziGb6zBKud3ufkzKkbY08uwWVDDVU8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}