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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '45a094b6f0c40b1ffff5ce840762ae9b542deeb0cd2a015d7182537a15611ea8' 
  AND token = '3MgGc7ZPjJX2r0PjyyeMrRSaXGphvN5GKbEGRtJlQkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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