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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '524cc6d49f0289f14637195a928919ea2816ed37a61864902368d2347a24ab17' 
  AND token = 'rKfi5SJ/T3AVYDmYR831i36k9UeMDp0ifMDp8Rfv+ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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