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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3a663f9f7fab07b8ec910cefd06c93ef9ef5488e089ba951dbc84f3dc902751b' 
  AND token = 'BYruaUZuvxNto2VyPN/rjT7Qy9deZM+x1C2SN7++liQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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