Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f519a92d75beeddbe28bc1d4f5b5ba36b06d53066e7e71a0f9fdcd161f815a' 
  AND token = 'aBJffp6g1t+5hlglm5od6PRsFgVD3Ywz1YQupXYM2Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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