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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cf66e7fb17bed339832d277013e8dae93e6a5d9f2a0c085cca6c0b2fea8deecb' 
  AND token = 'QYJg2A7VikXwfugr0O7x1vyOZJJ5AneC3Kz7N6cX8h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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