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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '094e5b8c9f0087a4ffb7f18651703a820d3b90253a6dc7a671142250a2532b53' 
  AND token = '5sZcUMKse40Zfv0oBsd1urD1GE552jTOOCH/DIqqElc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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