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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f1fe21264e8004a73741698590c4b78e6d0bd6a980be0ceddaa7735b8a1f0f80' 
  AND token = 'ognQ3oJlRbNMPT6bDQ4HeDx+f3w30ySVjqjUjqa0PQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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