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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ce67aa83cbd306c9ddc0722479b73ec6abc440020d18c5912540bb81362e5a5c' 
  AND token = '38YK5p1lXYH4Keu5lnC37mdVQjMHqOc4oL/d+6ajGUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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