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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a762b91752528c56ff0e8bb5dae66337b4eee481226afb60e4b8bb8311d06f67' 
  AND token = 'TgidgiI+hsloADzEMiorKfEQyE2pM9ynYcceHgmsX5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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