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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2a2206e3c912a95835b8ab6d17c6798f956690df740b0c7eff78ea51be430cd2' 
  AND token = 'zcCPK7x1kGUeyTkKdzmjjZIBlj87X1z5s7nzmJ3trvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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