Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46dd6a57ea13d1be1e09a141e768715252cd835a7def5159428eda9c124046d2' 
  AND token = 'SIWBRAam9o5W//iIT08Bd7oJA1r3aiM906+hLSKC93g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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