Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70f63aa4de82e46496009db3bfe669f1d6514eb083f2452ba331699e5a211d3' 
  AND token = 'Tn3XV/sNh8HZOd9Fp9ZvD53DmH1t/A3LtoRhRpJHCJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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