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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8df8a6cca8c0bf0677ee14e61954de71604b68c6071d0983be627c8d2eebf9ee' 
  AND token = 'KfYJ7WByrfaeY0iwM0ISNzOgsVcQTcV6FodCs2PTz10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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