Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68bff78a28031f97d4c6143b8f76b6cdcabfa2d74e7246ef1603ee8d86b0d8c4' 
  AND token = 'zHMiSBXRnQ0a0d/KTvAcMjIqDniw4AtTReSI0e+Uz5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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