Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d1a68e5c28a42bfcab124fb5b708f472ae1a81b03b439e6ef125de94392785' 
  AND token = 'reWfiJ0fvv1w5LTWPdXAIsrCHn+ifuixtBvmrIICh88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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