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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0d8944a83c56faa4bea5fe412f2c332dbb55f42ed281db6cc0c434411aa8ae70' 
  AND token = 'm9QnrcHh7Aebt4aaUwCp/mZIADNMpmM1imGc5GUXI5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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