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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'afd4561ac5e4b712358f39007e46f7dcffbf1f5ec975c54661e3e2e054d9c438' 
  AND token = 'UakL6kUrr4pk1qkA81w6j4hl3wDg8kfIoCODtABmXfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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