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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3d6a941a1d2aeb7840c24c8a2330900d30209b4bda537b7862cc12b06d002f9b' 
  AND token = '39zmkFPi1gqBEymsJiytH2IGuintkX6lX/ytqtoIOP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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