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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '77dd292fefeeac207082afdd9b4c9cb6a2cdece3f30be7bf61d49d20ef485408' 
  AND token = '6Emats4KwVC6rzr1C78vVhXiGiPl1fr9OofpvgcDZmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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