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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a7482bd53e4c7894532ece70857062d6c9c9ed2cf73695193dfed216648279ea' 
  AND token = 'ieArRF+9EoneF2RshyO/fxuZfQU1f/nrL5LfLr8f81A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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