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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '166bc05e7b222599599a6e5c90c2794f2ee79b1c14a15bd70abec5167473511d' 
  AND token = 's0gFGWZP6OaOilo6R2E9PY9b25ajLtDD522qv4M19PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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