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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f19b024f41efda59db289e608f600259aac76e2fe24777f8b087821964c3ee41' 
  AND token = 'HW+F9v8UV6n09WcX1m+SkNJkBRT+Aq+AdVaQaODqP54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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