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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1ec6cb660011018a862407710ff9bd6f08e372727637b986c2fccb1eb4a90994' 
  AND token = 'RL4FM+E6XWo16TR5nAX1xNk+Wnftt/GE9JphG9i6JgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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