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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'effed9488cf69b41ecf9406f45a52be1bf5d5a1171d3d4266399361b62223339' 
  AND token = '7Q4H9F1vD1tBBlcRPYY3i5NPxP5zXX+DIOGDTHdOXFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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