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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '586ef3cbd7e83fdde497c001650c07b8c6fea137a071fcf062563f5629d6b78e' 
  AND token = 'ZZOh1zEROWSbJM6mXndcUx9P01Gq+Io8Mq6ijcUOaLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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