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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dac5f9c9cc7bde76eedb9d41944abf3d65723e90f39c4b0019dc6b75452ea2ee' 
  AND token = 'v2qW7PrG2sKA6R7GhbSKqKZG8R9Ig6YWo/lK3rAS934=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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