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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a319addb26524436339e86db1829f5ff3be52823819797c6530dc01cbbb2d24c' 
  AND token = 'Fbw1MR22p0PDld7ifH73cSipyXdHw7QVS2oq+a/bzlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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