Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4c42b60764bee4c61a5f6ba0eaa9978a01962dcb1aebc2f0d49aa49406ac73' 
  AND token = 'w8i2ac1Y3PQrJbjv/O4LkHPdFlL3/mKVMFibNF2Hilg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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