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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '19b60186a27052985e0d0796cd3b5440b3d1001082e013f4a4c5145aac9681e0' 
  AND token = 'A/GXqKGfJJGYjT02IjKlWmhbxn8p5kcnx5JDNeJ7lUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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