Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57edd22b44618f9f22c2d4d14e4038b52398308d10c6ea734cffd4df185f5b0' 
  AND token = 'tVNoW5ZLp5TpJjdaTTtg7N+QzG9ELxTkuFxwXbU7HRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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