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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4ebafc5fafca142c280286005efac6022534f3bea65418d19da3bccce732d06f' 
  AND token = 'YVECefYclEyrTuc5g2x5iB5qY9YjBebvbn+JQgv2rBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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