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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '30fb7cdfefdb22a036ab6893a6146394fc951428a34aed613e7501b03615128c' 
  AND token = '4Oi2d6fKvi7Nt1xFcCtwACL+0zWcKIqX3ZSOcU6W3cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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