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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b43114e4673bcf23f609fc79818a7eb0cb7446714557116f76227cb88ac26b1b' 
  AND token = 'b07lM60OXNwcjs2kJzyjb9PhSc1JGDoGnMjP5E4rj/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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