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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6864ed245e6b90c7db9fb539f619776d787f745234eb0696a573d1a3d11e76db' 
  AND token = 'vb2DAg8g3OUK68y9uWgywHNWhE2b9t+gYoKlWoXu81c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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