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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ca64ee43dbdf78061ca107cb5e184ecc3654dec17d9539030d568e00e15357bf' 
  AND token = 'XVm3xwdLt9T/dql9ltbKE8T76UPfzOsdOpblaQ21Gf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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