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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fd4a2b3b6d41d97febeb4c7c43a5c437310b6c5a13eb9f61e6c7bdd3d5bc00a4' 
  AND token = 'B3pEdT3sseWnsktuW109Xcb9b6+3012GGwTk1S0qFtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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