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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5d243cae1826500ea4ca16e1fd61d8922d9b6a9622a33a1128e0a46f317137ca' 
  AND token = 'L1guXP364Mp01ONzPvFAkxFDN1cEDGVjU1SGo8CsVkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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