Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72cd3f8040ad308954ea682e934535d5852e7bf35f0f694e323aee740430fd25' 
  AND token = '/CK+02xCkmIZm4V7CASbgWQyQgObkT8einXXlaCFHIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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