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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '794fc55797faba3cf72c41279106c0d8e112e84890b8baf9a9971e50d2ba0c0a' 
  AND token = 'eGuawYfHdlXCxYDYGGE+1MIB+Ty0zRyrfngQo9YA6Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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