Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4843924b2885f552defe37b06c920b424585b9d3275c8e68e45af1c6ca3b4e6a' 
  AND token = 'P6ygvEywFf8LAtD35bOKvGMoaDYBnMg8OIRkHITtqtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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