Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '381b947cde26e6f6e98ec4f04e695f4e23854dedd472fa3461443837e8ca6fcd' 
  AND token = '7kPOcMf4HnswmB2cYsapGzzCI0YCgTzW3dAX0YVWOCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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