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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4a87f4304ce05d0518dd1a7c0ba270bfe42796b2df1d018488682d80ac339367' 
  AND token = 'ks5aTcn3TcNgIqIG4P7dCoX1coqvKBE1KU1lkQcqfoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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