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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c20d839bf38fa97fa8da7b49258dddfe0196cbe61c60141f15ecb3ae9a5718c8' 
  AND token = 'Wn1+L/IotLw0Q24mSwjqSqt9ouY9GXcEZW6+r0JWXPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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