Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a7c2830b0dd4ab4b4c8769734c4ac04e01c0448c6b2a4292937bd9f03f6696' 
  AND token = '3q+NLoXOs+rA8dtpMCPvv/Hf9UCBEEAqzuDxa7U9M5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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