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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f69aba1cfd5f6993d63e69320e9ee2d7770c66bbc20878fa3c5aed6bbffc5d0c' 
  AND token = 'NaqJLKRpacScIdrqLQlV2nvdo0/KUfKZdMWe5fANCp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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