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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd20dea769270592d0fa3438bcd285db61bdb23c12d83141f48cd9e5ed1e4780c' 
  AND token = '4W7xwIgG4ZZrgucE1yIZi/zNTGzO80X02CByTsdRX7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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