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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7739bb607c98a4a3799a50ddf311d92bb03c274db3bc1ceb7501355f72b259e1' 
  AND token = 'N/rUhV6ADjOzk8jYP/bn0y15s2KS1ytjg1yAYvaqLO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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