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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f1141d55eacb6d35dd11d5664425233331b2e4e8bed8c5b04f86955b573ad470' 
  AND token = 'mPk2NfvE/RgLr4lLoAvaIwAPh0mOsbaZBU2rirVjNlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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