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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '03b400560ada7b6e559c5bd51ae84a408bac8dd59b251c760d66ba1d1a9afddf' 
  AND token = '7X9gdZyX/l1wz4hOl/aVR5yQK7SMVD/Z4kFLWF8ysaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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