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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd3ae54be81df184e98d0c738dc4a1498820693377bd45b9d86b8bae8a3a552e6' 
  AND token = 'Xe8TX23CxzF7IRI/HGkMOJPJpWkPu66292spaDYbWbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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