Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa602d853a2abf2d9cefc40893d2eb1701b9be9ff2fcf188160f223d5049289a' 
  AND token = 'VUFDgOyUENzNQ2Gscp1nvh9f+dvi4/9Zo/jIV/hZBNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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