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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2c141de8e84a01eb7b6c408b1f937fc1defd8a66c270e4762407cbee580441f7' 
  AND token = 'StUN8vQVTm6K0oiqKapYBeN5ORrD/WOGmZs6wb2+wt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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