Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeeb45dcc1d7ddcd0aa4989a8cfde3810997e5d8d0129d8bc101c0b198f9b891' 
  AND token = 'DeKYMBvQcWuTmVYFJJz4iq2hmwvUBQVFH79+GZYM4Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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