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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '66e580354d47becf3f98c35e00783356a9225aa83613b11fcbaa2a90624722ae' 
  AND token = 'fOgQXQkTflve3vTDMqp39HLzJ8fBp52jQsaRaXDaJ9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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