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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '47c3c74a0dc218e1bd1535bb16646ec8eb69a53d725b036c47a237dbb47f15d0' 
  AND token = 'kt5++DozTqSgcJxysaCmekz3Pg648fcvyVlv41VOt0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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