Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73fe434b3c685cf6f2d421a54ff12420cdd2caa1a0d1d00027d55e63caba0271' 
  AND token = 'K1tynCjL4IAYe38cYcY/SmamHM476qbccI0VclF5peo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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