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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cd70edef2821d8ff0154b4239c60f453cdda3500b996ac9413831afd0c9573e5' 
  AND token = 'B2rVqIU7V1lRMmjkxlj3oPqkvX8181cwSqLRtsRqEeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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