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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0e4a6cc9d688b94a49ae251f0734d665fcdef9589723e122b684c6d794a1c1b8' 
  AND token = '0csEEJsbGFvG8tS08E+7S3GpcBlcBYhuDQT57d4hGOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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