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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '02026428a39e14347e7fad13bd5833cc1149b1538c2c6d67dcb019af79cfe0eb' 
  AND token = 'Kh6HE1E76Q6V1F3c5TtZpWCkqqoJvF4RE/1rKwQYCl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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